/*
* Galaxy
* Copyright (C) 2012 Parallel Universe Software Co.
*
* This file is part of Galaxy.
*
* Galaxy is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Galaxy is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Galaxy. If not, see <http://www.gnu.org/licenses/>.
*/
package co.paralleluniverse.galaxy.core;
import co.paralleluniverse.common.collection.TLongAbstractCollection;
import co.paralleluniverse.common.collection.TLongCompoundCollection;
import co.paralleluniverse.galaxy.StoreTransaction;
import gnu.trove.TLongCollection;
import gnu.trove.iterator.TLongIterator;
import gnu.trove.map.hash.TLongObjectHashMap;
import gnu.trove.procedure.TLongObjectProcedure;
import gnu.trove.set.hash.TLongHashSet;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
*
* @author pron
*/
public class Transaction extends StoreTransaction {
private TLongCollection lines;
private TLongHashSet ls;
private List<Op> ops;
private final TLongObjectHashMap<RollbackInfo> rollbackLog;
Transaction(boolean rollback) {
rollbackLog = rollback ? new TLongObjectHashMap<RollbackInfo>() : null;
}
synchronized void add(long id) {
if (ls == null)
ls = new TLongHashSet();
ls.add(id);
if (lines == null)
lines = ls;
else if (lines != ls)
((TLongCompoundCollection) lines).addCollection(ls);
}
synchronized void add(TLongCollection c) {
if (lines == null)
lines = new TLongCompoundCollection();
else if (lines == ls) {
lines = new TLongCompoundCollection();
((TLongCompoundCollection) lines).addCollection(ls);
}
((TLongCompoundCollection) lines).addCollection(c);
}
synchronized void add(Op op) {
if (ops == null)
ops = new ArrayList<Op>();
ops.add(op);
}
synchronized boolean isRecorded(long id) {
return rollbackLog.contains(id);
}
synchronized void recordRollback(long id, long version, boolean modified, byte[] data) {
RollbackInfo prev = rollbackLog.putIfAbsent(id, new RollbackInfo(version, modified, data));
assert prev == null;
}
synchronized TLongCollection getLines() {
return lines != null ? lines : TLongAbstractCollection.EMPTY_COLLECTION;
}
synchronized List<Op> getOps() {
return ops == null ? Collections.<Op>emptyList() : ops;
}
synchronized void forEachRollback(TLongObjectProcedure<RollbackInfo> proc) {
rollbackLog.forEachEntry(proc);
}
@Override
public synchronized Iterator<Long> iterator() {
if (lines == null)
return Collections.emptyIterator();
final TLongIterator it = lines.iterator();
return new Iterator<Long>() {
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public Long next() {
return it.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
@Override
public synchronized boolean contains(long id) {
if (lines == null)
return false;
return lines.contains(id);
}
public static class RollbackInfo {
public final long version;
public final boolean modified;
public final byte[] data;
public RollbackInfo(long version, boolean modified, byte[] data) {
this.version = version;
this.modified = modified;
this.data = data;
}
}
}